Features: This DC double-display voltage and current meter is small in size, compact design. It can display voltage and current at the same time with the LED display. Using common ground design, namely the earth wires of measurement and wire of power supply are mutual. Powered with DC4.5V~30V, and will not burn out if connected reversely. The input voltage should not be over 30V, otherwise it might be burned. Specifications: Type: 10A, 50A, 100A, 100A+Shunt (Optional) Power Supply Voltage: DC4.5V~30V (wide range, suitable for various occasions) Test Voltage: 0~100V Resolution: 0.1V Test Current Range: No more than 10A Resolution: 100mA (built-in frequency divider) Working Current: ≤20MA Display: 0.28"LED Measurement Rate: ≥100mS/time Measurement Accuracy: 1% (± 1 digit) Operating Temperature: -15℃~+70℃ Operating Humidity: 10~80% (no condensation) Sunlight: No direct sunlight Size: 4.8*3cm/1.9*1.2in Package Includes: 1 x Voltmeter 2 x Cables 1 x Shunt (optional, according to your choice) 1、This DC double-display voltage and current meter is small in size, compact design. 2、It can display voltage and current at the same time with the LED display. 3、Using common ground design, namely the earth wires of measurement and wire of power supply are mutual. 4、Powered with DC4.5V~30V, and will not burn out if connected reversely. 5、The input voltage should not be over 30V, otherwise it might be burned.